Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e183e9bb1862fc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 17:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0271761f55e5c05bbe45caeedcdcbd0 SHA-1: f98e42758d52165c2c392d1a239a7f89e6b9fba6 SHA-256: f9e183e9bb1862fcdcc6b12e8e4043b8f1f6e33565b675cf0e493a668d8bbf69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://likebarcode.com/image/files/20210703_182856.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d743e1380---xowosibujokulutatezorigeb.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/75451394473.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da34743bed4---vivebifuzej.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/47385641267.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e45c04b4---38512625457.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cb123a4fe575dfd2ded25f3a24eaab32/51489729373.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/xizerilagezaxuzowot.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/xovigeluvobetoxipa.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/runesofikebogomajuto.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/21541202188.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/96439275978.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5a7198779---gawovuvajasinu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/49484092079.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/490826035.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e6a31c47b74415ba2f4997f9ec69d66/10684759387.pdfIn PDF document text
    • https://morabia.fi/images/file/27978114773.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/88771538312.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d07d548b57e---37806452293.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc2829f3a---65293151050.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d01d4a134---34933896031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ralph+kimball+data+warehouse+toolkit+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 11124 bytes
SHA-256: 9e89607d0fed081506a92ad1bbdeadd8c43ba12434e186f593d291467c0486d8
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 18268 bytes
SHA-256: 25157f418a6609104beb42011f63df82e480e0f6fa5844a69e84c755f7142e0e

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